Die head for threading machines and the like



Jan; 10, 1928.

- L. S. HALL ms HEAD FOR THREADING MACHINES AND THE LIKE Filed June 20,1925 INVENTOR. 1.51/56). #444 ATT'Q EY Patented Jan. 10, 1928. r

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Application fil ed m; 20, 19255 Serial m; 38,599.. My invention relatesgenerally to'a" die: head, particularly those; which are adapted-to cuttli'read on pipe,:bolts or other materials,

' The primary object ,o-f ny invention is to provide a inecha'nisnjiforopening and c'losing the diehead andjwhich has combined therewithamicrometer adjustment operable after the head ,hasbeenclosed to"approxi- I v V These chaserbits aresecured in position in 4 'ntablemanner as bymeans'ofclamping mately the required point.

:Another .ob 'ect is to provide;

actual threading operation, and also check the accuracy of thediesetting;

A still further'object'rs to provide rneans the movement of vthe chaseror die holden.

' Still another object-' is 'to provide such a, mechanism as will be's'lmple iii operation, in-

expensive to manufacture" and V yet'positi've and precisein itsmovement;

Other objects and advantages in detailsof construction and operationwill' be apparent as the description proceeds, reference being.

had to the accompanyihg drawingwherein like reference numerals indicateIn the drawing v v Figure 1c is a front view ofimy improved die headshowing mechanism thereon;

nism;

.Figure 3 is a side view of the head show ih in outline; theadjustingmechanisrn and the indicating means. I

Figure 4 is a detail cross sectional view illustrating the relationbetween the remove able pin carriedby the diehol'dei's and theclosedopenings in the cam plate. 7 e It willbe understood, ofcourse",that while iny invention has been illiistrated:andiwillbe describedasapplied to a die head for chasing tr cutting thread on pipe or bolts;the same is capable with slight modifieationsof adaptation to many othermachines, wherein the cutting dies are adapted for opening and' closlng.V v I V My improved head includes thfl'lgidfhead stock 1, provided atequally spaced'int'ervals l around its circumference with o nings- 2,

ii idicating, means by Which I theioperator of the machine can tellvwhen the proper {length of'thread has been out without theinecessity ofguess Wo-rlrhereto-fore employed by watching the,

like parts. I

the opening and closing Figure 2 is a top plan view of the mecha v fed,

' l d al y are; chaser holders a, carrying, at their inner radia ed; Weth opening 2 a endsthe chaser bits or thread cutting dies 5;

plates 6.

y A circular bush ing bearing I 7 lines theo eningS and is secured inposition to the head stock 1, as by: bOItS Sr RQtatB'bIY In'ounted uponthis ring bearing: and lying flush against the face othead i stock 1, isa cam plate 9 provided, on its; inner facejwith cam grooves or slots 10;as shown in dotted linesin Figure 1; Each of the chaser holders providedintermediate its end with a headed ipin, ll-seating rin la smooth boredopening 1 0%, the head ofwhich engages within'the slot or groove 10' inthe cam plate. It

will b e understood thereforethat with the partsassembled in;this-relation, rotation of the cam plate will result inan'evenland uni-4 form sliding; movement, of the chaser holders with-in theirslideway'sr 2. 1 i

I Openings are provided at, equal distantly spacedpoints" on the faceof; the cam plate,

, which openings are covered: with the remov able cap 12; Thepositionoftheseopenings isv'such thatwhen the chaser holdersare movedfoutwardly;bythe cam, plate; to {the will. be disposed directly beneath theopening. 'T'liis enables the operator by removing I thec'oyercap 12 to"withdraw the headed pins limit of their movement, the headed pin ,11

from the; openings10whereupon the-en-, I

bracket 14,. UrTheupper 'end ofithis bracket I l t i s provided with 'anopening; through which passesa screwthreaded shaft lo The: portion ofth'e' bracket through which the screw 15 passes,isalsoyrecessed, as at16 to receive ,a nutor thumb piece 17; through which itliescrew l5 isthreaded and by means of whiehsaid screw is adjusted within thebracket-x1e. c A I lock; nut 18, is; received jupon the outer projectinglend of the screw 15 whereby said screw may be securely locked in itsadjusted position. u

The inner endot screw carries an eye 19 through which passes the pivot20 carrying and hetween the endsthe'reot, as at 26, is

one end o1 the link 27 carrying at its opiposite end ably engaging theedge of the cam plate 9.

v This means comprises a block or shoe. 28 provide-dwith a shoulder 29for engaging the rear side 01 the cam plate 9, the edge of the headstock 1 being cut away at this point to receive said shoulder. Aclamping plate 31 is provided with a projecting lip 32 for engaging thefront surface of the cam plate,

9, and maybe loosely or tightened thereon by means of bolt 33 passingthrough the shoe 28 and clamping plate 31 and provided at its outer endwith a tightening screw 34. The

inner end of bolt 33 passes through link 27 and is secured thereto as bymeans of a nut 35.

fA' pointer or other indicating marks 36 is mounted upon the peripheryof the cam plate 9 at one side thereof to register with a scale 37 uponthe adjacent edge of the head stock 1. i

The operation of lows: Assuming the parts to be in the position shown inFigure 1, and it being desired to thread the-section of pipe of a largerdiameter than that for which the chasers are set, the operator firstloosens the nut- 34 on the clamping plate 31- and grasping the handle 38mountedupon the edge. of the cam plate 9, rotatessaid cam plateto openthe die untilthe pointer or indicator 36 in- 'dicates on the scale'37that the dies are in proper position to thread a pipe of the desireddiameter. The screw 34 is then again tightenedthus securing the cam ringto the vlink 27. The handle is then raised to the position shown indotted lines in'Figure 1, which operation through the'medium of link 2'?acts to open the die for the reception of the pipe. v I

Q The end of pipe'is then placed in position to be engaged by the chaserbit 5 and the handle 25 again lowered, thus bringing the chasers 'back'to the point to which they were previously'set as indicated by the scale37. If, ho'weventhere should have been a slight error" in the setting ofthe clampingplate 31 on the cam plate 9, or if the pipe should varyslightly in its supposed diameten'it is not necessary to again loosenthe screw 34 and readjust the dies through the mediummeans for removablyand adjust- I eration, the operator merely grasps the end thread beingcut.

my invention is as fol:

pointer '35 and 37' indicate that the proper adj ustment has been madewhereupon the set 'screw18 may he again tightened and the die is readytor' operation.

Upon completion of the threading opot the handle 25, raising it upwardlywhich immediately opens the die and permits the threaded end of pipe topass on to the open ing 3 in the head where it may be chamfered or cutoff as may be desired.

, It will be understood too that should there be an automatic receivingattachment on the machine wl'iereby the cam plate 9 is moved as thethreading operation progresses whereby to cut a taper thread, the scaleand pointer 36 and 37 will function to indicatethe length of Theoperator watching this indicator-may at the proper moment raise thehandle 25 and open the die promptly atthe proper time.

The simplicity and the many advantages of this device will be obvious tothose skilled in the art. They will also understand that theconstruction as shown and described herein is susceptible to variouschanges in details of construction without departing from the spirit andscope of the invention.

I do not limit myself therefore to the exact structure shown other thanby the appended claims. Y

I claim:

1. A die head comprising movable chaser holders,- a cam plate for movingsaid holders. a bracket on said'head,-an adjusting screw threadedthrough said bracket, pivotmeans on one extreme end of said screw, alever'pivoted at one end to said means, a link pivoted to andintermediate the ends of said lever and within the vertical planethereof, saidlink carrying clamping: means engaging said cam plate andincluding a member-frictionally engaging the edge of said plate andadjustably secured thereto.

'2; A die'head comprising movable chaser holders,a cam plate for movingsaid holders, means removably mounted in said holdcrs connecting saidcam plate and said holders, said cam plate being provided with means ofaccess to said connecting means to permit the removal thereof throughsaid plate.

1 3. A die head comprising movable chaser holders, a cam plate formoving said holders, headed studs removably mounted in said 1 ,055,542 fY a '83 holders connecting the same with said cam holders Connectingsame with said Cam plate, said 'came plate being provided with plate,said cam plate being provided with e openings permitting access to saidstuds for openings Zpermittingaccess to the said studs the Withdrawalthereof. for the withdrawal thereof, and closure ca 5 a 4. A die head,Comprising movable chaser for said openingson the outer face of saidholders, a cam plate for moving said holders, camplate. a headed studsremovably mounted in said I LESLIE S. HALL,

